what is significant about this quote?

Lady Blakeney comes to, realizing she is outside the hut with Chauvelin and his soldiers just as they're waiting to ambush those waiting inside. Chauvelin tells her that she must remain silent if she wants her brother to remain alive. Lady Blakeney doesn't know what to do -- whether to save her brother or Percy -- but just then she hears Percy's voice singing 'God save the King!' out in the distance. Knowing Percy is okay allows Lady Blakeney to run to the hut and shout for those inside to save themselves.